Variable stiffness actuator with electrically modulated stiffness
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United States of America Patent
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Aug 9, 2022
Grant Date -
May 6, 2021
app pub date -
Dec 15, 2020
filing date -
Aug 23, 2017
priority date (Note) -
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Abstract
A dielectric elastomer system (DES) variable stiffness actuator (VSA) is provided. In an embodiment, the DES VSA includes a variable stiffness module (VSM). The VSM includes a DES that softens when energized and stiffens when unpowered, an outer frame, and an inner frame member. The stiffness of the DES is variable. The outer frame supports the DES and the inner frame member, which is disposed within the DES. The inner frame member is configured to be displaceable with respect to the outer frame. The DES VSA also includes an actuation motor mechanically coupled to the inner frame member that is configured to cause a force to be applied to the inner frame member and the actuation motor is configured to control an equilibrium position of the DES VSA.
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